Power Window Motor Current Control for Noise Obstacle Detection
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Solution Overview
Problem
Existing power window control systems often malfunction by incorrectly identifying noise from bumps or unpaved roads as obstacles, leading to unnecessary execution of safety functions, which can cause accidents when there are no actual obstructions.
Innovation Solution
The system measures the output current of the driving motor to calculate and store the current reduction time, delaying the execution of the safety function by this duration when interruptions are sensed, thereby distinguishing between noise-induced and actual obstacle-related interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the safety function is executed immediately when an interruption in ascending of the window glass is sensed, then the safety response speed is improved, but false activation occurs when noise from bumps or unpaved roads is misidentified as obstacles
Solution Approach 1:
The system performs preliminary measurement of output current characteristics before executing the safety function. By measuring the output current of the driving motor and calculating the current reduction time in advance, the system prepares the necessary data to distinguish between actual obstacles and noise-induced interruptions, enabling accurate safety activation without unnecessary delays
Solution Approach 2:
The system uses feedback from output current measurement to determine whether to activate the safety function. By continuously monitoring the output current of the driving motor and comparing it against predetermined thresholds and time characteristics, the system receives feedback that enables intelligent decision-making between immediate safety activation and temporary delay to avoid false positives
2Measurement precision
If the output current measurement and current reduction time calculation are implemented, then the distinction between noise and actual obstacles is improved, but the device complexity increases
Solution Approach 1:
The system uses the existing driving motor's output current as a self-service diagnostic tool. Rather than adding separate sensors or detection devices, the control apparatus leverages the electrical characteristics already present in the motor operation to detect obstacles and distinguish them from noise, eliminating the need for additional hardware components
Solution Approach 2:
The system replaces potential mechanical obstacle detection methods with electrical measurement of output current. By substituting mechanical sensing with electrical characteristic analysis, the system achieves precise obstacle detection with simpler and more reliable electronic components rather than complex mechanical sensors
Data Source
AI summary
An apparatus and method of controlling a power window by using an output current of a driving motor. The output current is measured to calculate and store a current reduction time, and then, execution of a safety function is delayed when an interruption in ascending of the window glass is sensed, so that interruption caused by noise generated when a car moves over an unpaved road or road bumps may be distinguished from interruption caused by an actual obstacle. Then, the safety function is prevented from being executed if the interruption in the ascending of the window glass is caused by the noise. Therefore, the interruption of the ascending of window glass due to the noise generated when the car moves on the unpaved road or road bumps may be distinguished without using an additional sensor.